PlayNotes.java

package com.jsyn.examples;

import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.instruments.SubtractiveSynthVoice;
import com.jsyn.unitgen.LineOut;
import com.jsyn.unitgen.UnitGenerator;
import com.jsyn.unitgen.UnitVoice;
import com.softsynth.shared.time.TimeStamp;

/**
 * Play notes using timestamped noteOn and noteOff methods of the UnitVoice.
 * 
 * @author Phil Burk (C) 2009 Mobileer Inc
 * 
 */
public class PlayNotes
{
	Synthesizer synth;
	UnitGenerator ugen;
	UnitVoice voice;
	LineOut lineOut;

	private void test()
	{
		// Create a context for the synthesizer.
		synth = JSyn.createSynthesizer();
		// Set output latency to 123 msec because this is not an interactive app.
		synth.getAudioDeviceManager().setSuggestedOutputLatency( 0.123 );
		
		// Add a tone generator.
		//synth.add( ugen = new SawtoothOscillator() );
		//synth.add( ugen = new SineOscillator() );
		synth.add( ugen = new SubtractiveSynthVoice() );
		voice = (UnitVoice) ugen;
		// Add an output mixer.
		synth.add( lineOut = new LineOut() );
		
		// Connect the oscillator to the left and right audio output.
		voice.getOutput().connect( 0, lineOut.input, 0 );
		voice.getOutput().connect( 0, lineOut.input, 1 );
		
		// Start synthesizer using default stereo output at 44100 Hz.
		synth.start();

		// Get synthesizer time in seconds.
		double timeNow = synth.getCurrentTime();

		// Advance to a near future time so we have a clean start.
		TimeStamp timeStamp = new TimeStamp(timeNow + 0.5);

		// We only need to start the LineOut. It will pull data from the
		// oscillator.
		synth.startUnit( lineOut, timeStamp );
		
		// Schedule a note on and off.
		double freq = 400.0; // hertz
		voice.noteOn( freq, 0.5, timeStamp );
		voice.noteOff( timeStamp.makeRelative( 0.4 ) );

		// Schedule this to happen a bit later.
		timeStamp = timeStamp.makeRelative( 1.0 );
		freq *= 1.5; // up a perfect fifth
		voice.noteOn( freq, 0.5, timeStamp );
		voice.noteOff( timeStamp.makeRelative( 0.4 ) );

		timeStamp = timeStamp.makeRelative( 1.0 );
		freq *= 4.0 / 5.0; // down a major third
		voice.noteOn( freq, 0.5, timeStamp );
		voice.noteOff( timeStamp.makeRelative( 0.4 ) );

		// Sleep while the song is being generated in the background thread.
		try
		{
			System.out.println("Sleep while synthesizing.");
			synth.sleepUntil( timeStamp.getTime() + 2.0 );
			System.out.println("Woke up...");
		} catch( InterruptedException e )
		{
			e.printStackTrace();
		}

		// Stop everything.
		synth.stop();
	}

	public static void main( String[] args )
	{
		new PlayNotes().test();
	}
}